Molluscs
- Created by: heathercross
- Created on: 08-11-16 11:18
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- Molluscs
- key features
- bilateral symmetry
- triploblastic
- coelomates
- protostomes
- 93000 species
- marine F.W terrestial
- seafood
- body plan
- muscular foot
- movement
- visceral mass
- contains internal organs
- mantle
- fold of tissue over visceral mass that secretes a shell
- nervous system
- nerve ring round oesophagus with ventral nerve cords
- digestive system
- radula and long digestive tract with coiled visceral mass
- circulatory system
- open circulatory system, dorsally heart pumps haemolymph through arteries into sinuses
- excretory system
- nephridia removing metabolic waste from haemolymph
- muscular foot
- classification
- Gastropoda - marine FW snails torsion in shells
- 8 classes but we only need 4
- Bivalvia - marine flattened shell, (clams) filter feeder, attach to rocks by tentacles. parasitic youth
- cephalopoda - marine squid, head with tentacles, siphon jet locomotion, carnivore, poison, spermatophores
- Polyplacophora - marine chitons oval shell with 8 dorsal plates no head separate sexes ferilise externally settle as youth
- key features
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